The leader of the House Democrats says the public needs to hear more of the intelligence that led the Obama administration to conclude that Syrian President Bashar Assad killed hundreds of his people using chemical weapons.

President Barack Obama gained ground Tuesday in his drive for congressional backing of a military strike against Syria, winning critical support from House Speaker John Boehner while key Senate Democrats and Republicans agreed to back a no-combat-troops-on-the-ground action in retaliation for a chemical weapons attack.